Dewey, a down-on-his-luck musician, poses as a substitute teacher at a prestigious prep school and uniquely inspires his overachieving students to take a risk and create a secret rock band.

When Summer asks Tomika for help to become the lead singer, Tomika must choose between helping her friend and going for the role of the lead singer herself.

Principal Mullins installs surveillance cameras in all the classrooms, putting the band's secret in danger.

When Zack's father catches him playing the electric guitar at home, he moves Zack to another class with less distraction, causing Dewey and the kids to rebel.

The band books its first gig, but when the members cannot decide on a name, they split into two bands.